Sorry, when I wrote this: - make an image with my font (one of each from the alphabet), and repeating the alphabet with different levels of threshold. I think that internally Tesseract thresholds the images. Hard to explain this, but I think that it may improve the quality.
I missed to clarify that my intention is to train Tesseract with that image. 2010/7/28 Andres <[email protected]> > Hello, > > I'm working on the same as you, for the licence plates from Argentina, as I > live in Argentina. > > Same as you described, the problem was to locate the licence plate. > > Now I'm working with the OCR and then I will work on horizontalizing the > images, because if they are not completely horizontal, the OCR fails, for > example today I was getting a 5 instead a of a 6. When I horizontalized the > image with photoshop, everything turned to ok. > > I dont know how is the layout of the positions of letters and numbers in > California plates, are they assorted ? ...if you know if the character > should be a number or a letter according to its position, you have two > options (as far as I know): > > - when recognizing char by char, tell Tesseract that you expect a number or > a letter. I saw that in somewere inside the source code, don't remember > where. > - make your own conversion, e.g., if you are expecting a number and you get > a G, map it to a 6, if you expect a 2 map it to a Z. > > I think that I'll use the last one, I'm not on that part yet. I'm getting > good results on images where the characters are big because of the distance > of the camera, but in small letters (13 pixels height) things are not good. > > So I have a pair of ideas to test, perhaps somebody from the group could > give me opinions regarding them: > - following the contour, with polygon approximation of the chars, making an > image with that contours and running Tesseract on that image (trained for > that) > - make an image with my font (one of each from the alphabet), and repeating > the alphabet with different levels of threshold. I think that internally > Tesseract thresholds the images. Hard to explain this, but I think that it > may improve the quality. > > If you want to continue speaking about specifics of licence plate > recognition, we can continue privately because it's off topic. I'm > interested in continuing. There are many things to speak about, for example, > the prices of the cameras, light filters, times of execution, etc. > > You can write me to andrej100 at gmail > > Regards, > > Andres > > > > 2010/7/28 ZIA <[email protected]> > > I am writing a license plate recognition application in C#. I am >> almost done, i have started work on my own OCR,but then I decided to >> use tessearact-ocr, which now partially works. I provide the >> california license plate to ocr, but some of the font, it doesn't >> recognizes, for example, like "Z" becomes number 2, letter "O" becomes >> "U", and number 4 becomes something else. Any suggestion? any language >> file or font file that will solve this issue. Beside that in complex >> images, i am having hard time to locate License plate. but my concern >> is now on ocr, since i thought i would save time by using tesseract >> then writing my own neural network. I would really appreciate any >> ideas or suggestions. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "tesseract-ocr" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<tesseract-ocr%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/tesseract-ocr?hl=en. >> >> > -- You received this message because you are subscribed to the Google Groups "tesseract-ocr" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/tesseract-ocr?hl=en.
